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    22．Science and technology have in important ways to the improvement of agricultural production. A． attached B． contributed C． submitted D． referred 【查看更多】

     

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    Science and technology have ____ in important ways to the improvement of agricultural production.

    A． connected          B． assisted     C． contributed         D． witnessed

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    Science and technology have in important ways _________ the improvement of agricultural production．

    [　　]

    A．contributed to

    B．resulted from

    C．carried off

    D．handed over

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